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首页> 外文期刊>International Journal of Electrochemical Science >Synthesis of β-LiVOPO4/C by Sol-gel Method and Microwave Sintering as Cathode Material for Lithium Ion Batteries
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Synthesis of β-LiVOPO4/C by Sol-gel Method and Microwave Sintering as Cathode Material for Lithium Ion Batteries

机译：溶胶-凝胶法合成β-LiVOPO 4 / C及微波烧结作为锂离子电池正极材料

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摘要

The pure phase of β-LiVOPO4/C materials was synthesized by sol-gel method and microwave sintering with a starting material of V2O5, H3PO4, LiNO3 and citric acid in microwave oven calcined for 5 min at the power of 900 W. The micro-structure was detected by X -ray diffraction (XRD) and the transmission electron microscopy (TEM) was also conducted to observe morphology of the material. Meanwhile, electrochemical property were also characterized by constant charge/discharge test, AC impedance and Cyclic voltammetry test. The results indicated that the external of LiVOPO4 was coated on amorphous carbon with a thickness of 1.57 nm, which originated from citric acid, and enhanced the ionic conductivity of the material. Besides, the first discharge capacity is 94.5 mAh·g-1 between 3 V and 4.5 V at the rate of C/20. The discharge capacity of β-LiVOPO4/C maintained at 88.6 mAh·g-1, which has 93.8% capacity retention after 30 cycles.
机译：β-LiVOPO4/ C材料的纯相是通过溶胶-凝胶法合成的，并用V2O5，H3PO4，LiNO3和柠檬酸的原料在微波炉中以900 W的功率煅烧5分钟进行微波烧结。通过X射线衍射（XRD）检测结构，并且还进行了透射电子显微镜（TEM）以观察材料的形态。同时，还通过恒充放电试验，交流阻抗和循环伏安法测试表征了电化学性能。结果表明，LiVOPO4的外部被覆在厚度为1.57 nm的无定形碳上，该碳源于柠檬酸，并增强了材料的离子电导率。此外，在3V至4.5V之间以C / 20的速率的第一放电容量为94.5mAh·g-1。 β-LiVOPO4/ C的放电容量保持在88.6 mAh·g-1，经过30个循环后具有93.8％的容量保持率。

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